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Cationic liposome-mediated efficient induction of type I interferons by a low dose of poly I:poly C in mouse cell

S Okamoto1, Y Watanabe, Y Takakura

  • 1Departments of Drug Delivery Research Kyoto University, Sakyo-ku, Kyoto, 606-8501, Japan.

Journal of Biochemistry
|October 2, 1998
PubMed

Insights

Complexing poly I:poly C with cationic reagents like Lipofectin significantly enhances type I interferon (IFN) induction. This method uses lower, non-cytotoxic doses and short treatment times, showing potential for clinical applications.

Area of Science:

  • Immunology
  • Molecular Biology

Background:

  • Double-stranded polyriboinosinic acid:polyribocytidylic acid (poly I:poly C) effectively induces type I interferons (IFNs).
  • High doses of poly I:poly C required for efficient IFN induction can be cytotoxic.

Purpose of the Study:

  • To investigate the IFN-inducibility of poly I:poly C complexed with cationic reagents.
  • To determine if complexation can reduce the required dose and cytotoxicity of poly I:poly C for IFN induction.

Main Methods:

  • Poly I:poly C was complexed with cationic reagents (Lipofectin, LipofectACE).
  • Interferon (IFN) production was measured in mouse fibroblast L cells treated with these complexes.
  • Cytotoxicity and optimal treatment conditions (dose, time) were assessed.

Main Results:

  • Lipofectin and LipofectACE complexes induced substantial type I IFNs (mostly beta-type) at doses two orders lower than poly I:poly C alone.
  • Optimal induction occurred at 0.1 microgram/ml poly I:poly C with 2-10 microgram/ml of Lipofectin/LipofectACE.
  • These conditions showed no significant cytotoxicity and required short treatment times (<10 min).

Conclusions:

  • Complexing poly I:poly C with Lipofectin or LipofectACE enhances IFN induction efficacy.
  • This novel method allows for lower, non-cytotoxic doses and short treatment durations.
  • The approach is applicable across cell types and species, suggesting potential for clinical use in IFN induction.

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